Cartersoceras
Encyclopedia
Cartersoceras is a nautiloid cephalopod genus placed in the Orthocerid
family Baltoceratidae
, established by Rousseau Flower, 1964, for species formally included in part in Murrayoceras
, and in part in "Sacotoceras", which are typical of Murrayoceras in all features except that the siphuncle segments are convex in outline. It is known from the Middle Ordovician of the eastern United States.
The type species Cartersoceras shideliri Flower from the Carters Limestone, Beach Grove, Tennessee, shows a ventral rod secreted calcite in the siphuncle and thick, fibrous connecting rings which are not layered as in early Ellesmerocerida
. C.noveboracense, originally referred to Murrayoceras, from the Amsterdam Limestone of New York, known from a weathered portion of the phragmocone, shows part of the siphuncle filled with calcite, determined to represent a secreted ventral rod.. The ventral rod and unlayered connecting rings were used to place this genus in the rod-bearing Baltoceratidae
.
Frey (1995)
retained Cartersoceras in the Baltoceratidae while Kroger et al (2007) included it in the Sactorthoceratidae
, in spite of the ventral rod.
Carteroceras is probably closely related to genera like Rhabdiferoceras
and Murrayoceras
and more distantly to such as Tajaroceras
and Veneficoceras
Orthocerida
Orthocerida is an order of extinct nautiloid cephalopods also known as the Michelinocerda that lived from the Early Ordovician possibly to the Late Triassic . A fossil found in the Caucasus suggests they may even have survived until the Early Cretaceous...
family Baltoceratidae
Baltoceratidae
Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, existing for approximately .-Taxonomy:Baltoceratidae was...
, established by Rousseau Flower, 1964, for species formally included in part in Murrayoceras
Murrayoceras
Murrayoceras is a nautilid cephalopod included in the orthocerid family Baltoceratidae, wide spread in the Middle Ordovician of North America, characterized by a depressed orthoconic shell with a subtriangular cross section and flattened venter and a proportionally large verntral siphuncle, 0.15...
, and in part in "Sacotoceras", which are typical of Murrayoceras in all features except that the siphuncle segments are convex in outline. It is known from the Middle Ordovician of the eastern United States.
The type species Cartersoceras shideliri Flower from the Carters Limestone, Beach Grove, Tennessee, shows a ventral rod secreted calcite in the siphuncle and thick, fibrous connecting rings which are not layered as in early Ellesmerocerida
Ellesmerocerida
The Ellesmerocerida is a order of primitive cephalopods belonging to the subclass Nautiloidea with a widespread distribution that lived during the Late Cambrian and Ordovician.-Morphology:...
. C.noveboracense, originally referred to Murrayoceras, from the Amsterdam Limestone of New York, known from a weathered portion of the phragmocone, shows part of the siphuncle filled with calcite, determined to represent a secreted ventral rod.. The ventral rod and unlayered connecting rings were used to place this genus in the rod-bearing Baltoceratidae
Baltoceratidae
Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, existing for approximately .-Taxonomy:Baltoceratidae was...
.
Frey (1995)
retained Cartersoceras in the Baltoceratidae while Kroger et al (2007) included it in the Sactorthoceratidae
Sactorthoceratidae
The Sactorthoceratidae comprise Orthocerataceaen genera with a subcentral suborthochoanitic siphuncle composed of slightly expanded segments and free of organic depsits...
, in spite of the ventral rod.
Carteroceras is probably closely related to genera like Rhabdiferoceras
Rhabdiferoceras
Rhabdiferoceras is an extinct orthocerid genus belonging to the Baltoceratidae that lived in what would be North America during the Cassinian Stage at the end of the Early Ordovician, existing for approximately two million years from about 474 -472 mya....
and Murrayoceras
Murrayoceras
Murrayoceras is a nautilid cephalopod included in the orthocerid family Baltoceratidae, wide spread in the Middle Ordovician of North America, characterized by a depressed orthoconic shell with a subtriangular cross section and flattened venter and a proportionally large verntral siphuncle, 0.15...
and more distantly to such as Tajaroceras
Tajaroceras
Tejaroceras is an extinct slender cephalopod from the uppermost Lower Ordovician of western North America, belonging to the Orthocerid family Troedssonellidae....
and Veneficoceras
Veneficoceras
Veneficoceras is a member of the rod-bearing Baltoceratidae, an extinct cephalopod family with characteristics of the orthoceratoid Dissidocerida, found in Cassinianage, Lower Ordovician, limestone in western Utah....